Adapter unit for a personal digital assistant



FIG. 1 is a bottom perspective view of an adapter unit for a personal digital assistant showing my new design;

FIG. 2 is a bottom plain view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a front elevation view thereof; and,

FIG. 6 is a rear elevation view thereof. 

The ornamental design for an adapter unit for a personal digital assistant, as shown and described. 